> If you've got any evidence of x= in the wild that you care to share,
> thank you kindly in advance!

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=customer.domain; s=k3;
        t=1728563812; x=1728824312; i=news@customer.domain;
        bh=x;
        h=Subject:From:Reply-To:To:Date:Message-ID:X-MC-User:Feedback-ID:
         List-ID:List-Unsubscribe:List-Unsubscribe-Post:Content-Type:
         MIME-Version:CC:Date:Subject:From;
        b=x

Mailchimp does this.

-- 
Atro Tossavainen, Founder, Partner
Koli-Lõks OÜ (reg. no. 12815457, VAT ID EE101811635)
Tallinn, Estonia
tel. +372-5883-4269, https://www.koliloks.eu/
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